Patterngraph apparatus

ABSTRACT

The apparatus serves to draw various geometric patterns on circular sheets of paper. Primarily, it consists of a base having a hand operated drive wheel that rotates a turntable, to which a piece of circular paper has been attached by pins sticking up from its surface. It also includes an adjustable pen holder support, which is fastened to a guide rod which is removably received, at one end, in any one of a number of grooves in a weave rack rod fastened to the base, and the other end of the guide rod is removably received in any one of several openings in a French curve arm pivotally adjustable on the drive wheel.

This invention relates to drawing instruments, and more particularly, toa patterngraph apparatus.

The principal object of this invention is to provide a patterngraphapparatus, which will be unique in design for drawing an infinite numberof complicated and symmetrical figures.

Another object of this invention is to provide a patterngraph apparatus,which will be of such design, as to draw such figures at the move of oneof its components.

Another object of this invention is to provide a patterngraph, whichwill be of such design, as to be enjoyed by the whole family, and it maybe used by those aged five and up.

A further object of this invention is to provide a patterngraphapparatus, which will be capable of producing more than one hundredfigures.

Other objects are to provide a patterngraph apparatus, which is simplein design, inexpensive to manufacture, rugged in construction, easy touse, and efficient in operation.

These, and other objects, will be readily evident, upon a study of thefollowing specification, and the accompanying drawing, wherein:

FIG. 1 is a perspective view of the present invention, and

FIG. 2 is a top plan view of one of the figures that may be drawn by theinvention.

Accordingly, an apparatus 10 is shown to include a rectangular base 11,having a drive wheel 12 rotatable on a center pin 13, which is suitablysecured within an opening in the top of base 11, which is not shown. Aturntable 14 is provided, and is rotatable on a center pin 15 in the topof base 11, and drive wheel 12 and turntable 14 include an annulargroove 16 in their outer peripheries, which receives a drive belt 17 for12 and 14 to rotate simultaneously. A circular sheet of paper 18, foruse on apparatus 10, includes a plurality of equally and radially spacedopenings 18 therethrough, for receiving similarly arranged andprojecting pins 20, which are suitably secured within the top ofturntable 14, for rendering paper 18 stationary thereon.

A pen holder support member 21 is provided, and has a weight 22 suitablyfixedly secured to one end, for holding member 21 downward at itsscribing end, and an opening 23 through the top of weight 21 includes apen holder sleeve 24 therein, which removably receives a pen 25 fordrawing on paper 18. A rod guide plate 26 is received beneath supportmember 21, and an elongated cut-out opening 27, through member 21,receives a screw fastener 28, having a washer 29 thereon. Fastener 28 isthreaded into an opening through rod guide plate 26, and providesadjustment means for the travel of pen holder support member 21. A setscrew 30 is threaded into weight 22, for securing pen holder 24 at anydesired elevation within support member 21, and an "L"-shaped guide rod31 is provided, and one end thereof is removably received within any oneof a plurality of adjacent grooves 32 formed within a weave rack 33,which has its right angle end 34 suitably fixedly secured within anopening 35 in the top of base 11. The right angle end 36 of guide rod 31is removably received within any one of a plurality of random spacedopenings 37 in the top of French curve arm 38, which is pivotallyreceived on a pin 39, which is removably received within one of twoopenings 40 through drive wheel 12. A set screw 41 is received within anirregularly curved groove 42 through arm 38, and is threaded into anopening through plate 43 (which is not shown), and plate 43 is securedto the top of base 11 by means of suitable fasteners 44, one of which isshown. The screw 41 provides adjustment means for the different kinds ofpatterns to be drawn by apparatus 10, as illustrated by pattern 45having the geometric drawn form, consisting of lines 46 and the circles47.

In use, the base 11 is positioned so as to have the drive wheel 12 tothe right of the user. The weave rack rod 33 is then moved to anapproximately ninety degree angle with the edge of the base 11. The userthen places several of the round papers 18 on the turntable 14, andpresses them downward upon the pins 20, which will hold paper 18 inplace. The guide rod 31 is then placed with its long end within any oneof the grooves 32 of rack 33, and the end 36 of rod 31 is then placedinto any one of the openings 37 in French curve arm 38. The pen 25 isthen placed to about the center of the paper 18, and the user rotatesthe drive wheel 12, which will, in turn, rotate the turntable 14, thuscausing the pattern 45 or other similar type to be drawn.

A change of pattern 45 can be accomplished by moving the pen holder 24up or down, as desired, and in evey position the figure will bedifferent. By moving the pen 25 from right to left, the apparatus 10will change lines, and by moving the guide rod 31 to different openings37 in the French curve arm 38, the results is another figure or changeof positions, and finally, moving the guide rod 31 to any other groove32 of rack 33 will produce different figures, still of geometric form.

While various changes may be made in the detail construction, it isunderstood that such changes will be within the spirit and scope of thepresent invention, as is defined by the appended claims.

What I claim is:
 1. A patterngraph apparatus, comprising, incombination, a base, a first pin mounted upon said base, a drive wheelrotatably supported at its center on said pin, a turntable rotatablysupported at its center, upon a second pin mounted upon said base, anannular groove around said drive wheel and around said turntable, anendless belt in both said grooves transmitting rotational movementtherebetween, a plurality of upwardly projecting pins upon saidturntable, a sheet of paper having a plurality of openings receivingsaid projecting pins for removable securement of said paper upon saidturntable; an elongated arm having a longitudinally extending,irregularly curved slot being pivotally rocked about a screwstationarily mounted upon said base, said screw being received throughsaid arm slot, an eccentrically mounted pin upon said drive wheel beingalso received through said arm slot, an "L"-shaped guide rod, aplurality of holes along said arm selectively receiving a bent-down endof said guide rod; a guide rod rest pivotally mounted upon said base, arow of notches upon said guide rod rest selectively supporting anopposite end of said guide rod, a guide rod plate supported on saidguide rod, a pen-holding member extending transversely to said guiderod, being adjustably securable to said guide rod plate, and a pen uponan end of said pen-holding member for drawing a pattern upon said sheetof paper, when said drive wheel is rotated.